The Siberian tiger (Panthera tigris altaica) is also known as theAmur, Manchurian, Altaic, Korean, North China or, Ussuri tiger. Though it once ranged throughout Western and Central Asia and eastern Russia it is now completely confined to the Amur-Ussuri region of Primorsky Krai and Khabarovsk Krai in far eastern Siberia, where it is now protected. It is considered to be the biggest of the nine recent tiger subspecies and the largest living felid. Genetic research in 2009 revealed that the current Siberian tiger population is almost identical to the Caspian tiger, a now extinct western population once thought to have been a distinct subspecies. — Wikipedia